Intermittent Process Measurement of a Freeform Surface Profile with a Circular Triangulation Laser Probe on a Machining Centre

This paper describes the development of a non-contact type system for measuring a freeform surface on a machine tool. A laser probe, model OTM-3A20 made by Wolf & Back Co., was integrated into a CNC machining centre as a non-contact sensor. An adjustment device for the laser probe was designed to minimise the cosine error caused by assembly inaccuracy. An alignment test of the measuring laser beam was carried out using a calibrated specimen. The systematic accuracy of the circular triangulation laser probe and a standard triangulation laser probe, with respect to the surface roughness, surface slope, and coating colour of the workpiece, was investigated by using an HP5529A laser interferometer system. The measuring system, which consists of a personal computer, a CNC controller of a machining centre, a Renishaw MP10 touch-trigger probe system, and the controller of the laser probe system, was integrated information-technically. Automatic measuring software was developed for the purpose of measuring path simulation, generation of NC codes, and error analysis of the measured data. The profile error of the tested object, measured by the laser probe and the coordinate measuring machine respectively was found to be within 45 μm. In this case, the tolerance of the designed part is about 50 μm, so the developed system can be applied to the inspection of mould production in bakelite according to the experimental results. ID="A1"Correspondance and offprint requests to: Dr Fang-Jung Shiou, Department of Mechanical Engineering, National Taiwan University of Science and Technology, No. 43, Section 4, Keelung Rd. 106 Taipei, Taiwan. E-mail: shiou@mail.ntust.edu.tw     

2.25Cr-1Mo不锈复合钢板加氢高压换热器的制造

混氢原料油换热器是为安庆石化炼油厂制造的高压换热器，其主体材料为2．25Cr-1Mo＋0Cr18Ni11Ti复合钢板，对制造过程中的封头成型、加热、热处理、组对等方面进行了简介。     

同位素质谱用于医学的最新进展

利用＾１３Ｃ，＾１４Ｃ，＾１５Ｎ等同位素作为示踪剂来探测胃幽门螺杆菌（简称ＨＰ）的试验在近几年有了很大进展，为同位素质谱在医学上的应用开辟了一条新途径。＾１３Ｃ－尿素呼吸试验具有无放射性、无侵害、无污染、对患者无特殊要求等优点，而且方法简便，诊断的正确率达到９３％以上，＾１４Ｃ－尿素呼吸试验的灵敏度很高，准确率达到９６以上（但＾１４Ｃ有轻微的放射性，对孕妇和婴儿应当慎用）。近年来本实验室与医院合作     

热管吸附制冷机的实验研究与数值模拟

提出了一种太阳能制冷用热管吸附床 ,并通过实验与数值模拟考察了其传热性能。数值模拟表明 ,热管能明显地改善吸附床的传热性能 ,系统工作性能系数约能提高 7%～ 10 %。实验结果亦验证了这一点     

高压甲铵泵、液氨泵变频调速改造方案初探

初步探讨对尿素甲铵泵和液氨泵进行变频调速改造的可行性，对3种高压电动机变频调速方式进行了比较，提出2种可行的初步改造方案。     

尿素高压设备贴衬焊缝超声波检测

通过对焊缝各种缺陷试板的实验，优化出探头的各种参数，以达到探头的最佳参数配置。利用优化出的探头对设计的多种试块进行方法, 设计缺陷种类和尺寸具有良好的一致性。对现场衬板缝的检测及解剖，检测出的缺陷与实际缺陷的一致性比较好，确保了在尿素高压设备贴衬焊缝现场超声检测中对发现的缺陷是可信的。     

基于HP滤波的ARMA-ABCSVR-GABP网络流量预测

针对当前网络流量无法根据流量变化的特征进行预测,且通过单一或者组合模型依然得不到较高准确率的问题,提出一种基于HP(High-Pass Fliter)滤波的流量预测模型.基于高铁站流量数据日高夜低的周期特性以及流量波动增长的长期趋势,依据HP滤波将网络流量分解成周期序列及趋势序列.利用自回归-滑动平均模型(ARMA)对...     

一种大型纯凝汽轮发电机组对外供热改造新模式

为扩大600MW超临界纯凝机组的供热能力,达到热电联产的要求,研究了提高机组对外供热能力的几种技术措施,提出了退出#1、#2高压加热器,将原一、二段抽汽从再热冷段抽出以达到增大对外供热量的思路,并从对选择性催化还原（selective catalytic reduction,SCR）系统投入的影响、汽轮机高压缸末级叶片安全性、汽轮机轴向推力以及对经济性的影响等方面进行了论证分析,证明该改造模式可行,可供纯凝机组实施大流量低压供热改造时借鉴。     

京能热电2号机汽轮机DEH控制系统改造

介绍了北京京能股份有限公司2号机组的高压抗燃油纯电调控制系统改造的主要问题及其功能设计的主要特点,并提出了机组今后的完善方案。